Ventilated printing-press roller



Feb. 12 1924., 1,483,6711

c. H. MARTIN VENTILA'IED PRINTING PRESS ROLLER Filed Aug. 9, 1922Jmenzor Uar'las flyk M12222 Patented Feb. 12, 1924. I

. UNITED STATES CHARLES HUGH MARTIN, OF LOS ANGELES CALIFORNIA, ASSIGNORF ONE-HALF TO ANGELO FREDIANI, 01 LOS ANGELES, CALIFORNIA.

VENTILATED PRINT Application filed August 9,

To allwhom it may concern: Be it known that I, CHARLES HUGH Men- TIN, acitizen of the United States, resid1ng\ at Los Angeles, in the county ofLos Angeles and State of California, have invented a new and usefulVentilated Printing-Press Roller, of which the following is aspecification.

In the operation of printing presses, it frequently occurs that thefriction and pressure upon the inking roller heats the composition ofsuch roller to such an extent that it becomes loosened from the core, ormelts down, causing much expense and loss of time.

An object of this invention is to avoid this difficult and to therebygreatly .in-

crease the li e of the roller.

Another object of the invention is to minimize the amount of com ositionrequired for the printing roller 0 a printing press.

A further difficulty with printing press rollers as heretoforeconstructed arises from this liability 'to sag in the middle and anobject of this invention is to correct this difiiculty, and avoid suchsagging.

The invention practically includes a printing press roller having ahollow core, and in the preferred form such core is ventilated and airis passed therethrough.

A further object of this invention is to rovide a practical inkingroller with means or forcing air through the core-to cool it.

Inking rollers for printing presses comprise a rigid core and arecompleted by inserting such core into a cylindrical mold into whichcomposition is then poured to form upon the core, the ink carryingsurface of the roller and such core is provided with a flange to fit themold and form a bottom therein, upon which the composition is supportedin'the mold, and an object of this invention is to provide means wherebysuch composition may be molded and remolded on a hollow core havingmeans that will cause air flow through the core when the roller isrevolved. In the work of moldin composition onto the core, it is desirabe that the flanged end of the core be inserted into the mold and thatthe flange fit the mold and form a bottom therefor. It is preferablethat the draft producing means he so constructed as to extend beyond therim of the flange during operation so as to ING-PRESS ROLLER.

1922. Serial No. sauces.

drive away the air external to the flange and thus produce a pressuredrop at the outlet end of the draft core; and in order to practicallymeet the requirements I hinge vanes inside a ventilator in the form of'alantern Wheel having rungs in two circular ser1es, theouter rungs ofwhich form stops for vanes hinged to the inner rungs, the stops being soarranged that thevanes may be swung inside the circle of the flange whenat rest, and will swing to project outside such circle when the rolleris revolving.

. Other objects, advantages and features of nvention may appear from theaccompanymg drawing, the subjoined detail description and the appendedclaims.

The invention ma be carried out in various ways and I 0 not limit myselfto specific forms of construction.

The accompanying drawing illustrates the invention in a form I atpresent deem preferable. Y

Figure 1 is a fragmental perspective view of the metal parts of aninkingroller constructed in accordance with this invention,

omitting the roller composition.

F ig. 2 is a fragmental axial section of a ventilated printing rollerconstructed in accordance with what is shown in Fig. 1.

Fig. 3 is a cross section on' line a: a2 Fig. 2 cutting through theventilator or draft wheel and looking in the direction of the upperarrow.

Fig. 4 is a sectional elevation on line m -m*, Fig. 2, looking in thedirection'of the lower arrow.

Fig. 5 is a side elevation in reduced scale, of the roller shown inFigs. 1 and 2.

The journals or stub shafts 1 and 2 may be of any usual construction andmay be made from sections of cylindrical rods of cold rolled steel. Thetubular main shaft or hollow core 3 of the roller is provided with alongitudinal bore a, and is connected at one end to a hollow section 4,that forms a connection between the main shaft 2 and the hollow core 3and is perforated near the stub shaft by orifices 5, which allow air toflow through the bore to the ope-n end 6 near periphery of which isabout flush with, or of greater diameter than the periphery of theflange 7. A flange head 9 to which the stub shaft 1 is fixed,corresponds in diameter to the flange 7, and is connected thereto andspaced apart therefrom by suitable mea'ns as outer and inner rungs 10and 11. The rungs 10 are spaced equidistant apart at the periphery ofthe flange 7, and head 9, and the run s 11-are spaced equidistant apartin a circ e arranged inside the circle of the outer rungs. The innerrungs 11 are arranged midway between the radii on which the outer rungs10 are centered. A

; ventilator is thus formed, closed at one end by the imperforate head 9and opening from the bore. It is provided with vanes 12 pivotallymounted on the inner rungs 11 and of sufficient width to stop againstthe outer rungs 10 when at rest, and to project beyond the head 9 andflange 7 when swung by centrifugal force into position radial to theaxis of rotation.

By this arrangement the vanes are supported in retracted position andare free to swing out for the. purpose of creating a vacuum pressuredrop inside the hollow core 3 when the roller is revolved withsuflicient speed in either direction.

The flange 7 and head 9 .are considerably greater in diameter than thecore 3, so that the draft from the ventilating orifices is forcedthrough the core and the reel by the pressure drop created by the vanes.

In practical operation the vanes 12 are brought from the tangentposition shown in full lines in Figs. 3 and 4 to the radial positionindicated 'b dotted lines in Fig. 3 as the centrifugal orce set up bythe rotation of the roller increases. The force of the draft through thehollow roller core is relative to the space between the flanges and theprojection of the vanes beyond the circumference of said flanges and thespeed with which the roller is rotated.

The draft through the roller will be from the inlet 5 to the peripheryof the path of the fans formed by the revolving blades or vanes 12, andthe projecting portions of the blades produce the required pressure dropto cause a flow of cooling air through the roller shaft or core.

The inlet end of the hollow core or shaft is reduced and the inlets 5are closer to the axis of the roller than the periphery of the flangesor heads 7 and 9 so that the cooling air may readily enter the roller atthat end to supply the outflow at the ventilator formed by the heads orflanges 7 and 9, the connecting rungs 11 and 10 and the vanes 12.

Inking rollers are required to be of a proper thickness; and by makingthe roller core hollow, I have effected a saving of composition withoutreducing the efliciency of the roller; and at the same time I havereduced the weight and increased the ri idity of the roller; and byproviding for a on 1- tudinal draft and an internal cooling of t eroller I have given the roller greater life and made it practicall freefrom melting down under highspee operation, or long service.

I claim.

1. A printing press roller having a hollow core open at one end andperforated at the other end to allow flow of air therethrough, and meansat such other end to produce pressure drop for the purpose of causing aflow of air through the roller.

2. A printing press inking roller comprising a hollow core open at bothends and provided at one end with means for producing pressure drop.

3. A printing press inking roller having an open ended tubular core incombination with vanes pivotally arranged to produce pressure drop atone end of the core.

4:. A printing press roller comprising a hollow core open at its ends; aflange fixed to one end of said core; a flange spaced from and securedto said fixed flange; rungs between the fianges; vanes on said rungs;and stops to support the vanes in a retracted position; said vanes beingadapted to swing out under centrifugal force for producing a pressuredrop to cause air to flow through said hollow core.

5. A hollow roller provided with ventilating means comprising hingedvanes projecting beyond the periphery of the roller when radial to theaxis of the core; the inlet end of the roller being reduced so that theair flows in close to the axis where the peripheral speed is low and isthrown out at the other end where such speed is higher;

6. A roller comprising stub axles, a tube having openings at its ends;means connecting the tube to the stub axles; and air expelling means inone of such connections.

7. A roller provided at one end with a ventilator and a fan to expel airtherefrom; said roller also having a bore connected with said ventilatorand adapted to conduct air through the roller to the ventilator to coolthe roller.

In testimony whereof, I have hereunto set my hand at Los Angeles,California, this 3rd day of August, 1922.

CHARLES HUGH MARTIN. Witness:

J AM'ES R. Towxsnm).

